Steig-Dolomitschotter

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Representation and status

Color CMYK
(0%,16%,12%,16%)
Color RGB
R: 215 G: 180 B: 190
Rank
lithostratigraphic Formation
Validity
Unit is in Use
Status
informal term

Nomenclature

Deutsch
Steig-Dolomitschotter
Français
Gravier du Steig
English
Steig Gravel
Origin of the Name

Steig oberhalb von Dättlikon (ZH), östliche Ende des Irchels

Historical Variants
Irchel-Dolomitschotter (Graf 1993), Steig-Schotter (Preusser et al. 2011)

Description

Description

Graf 2000: Im SE des Irchel werden die älteren Schotter erosiv durch eine jüngere Schüttung abgeschnitten. Diese zeichnet sich durch eine Paläoströmung nach N und einen auffälligen Reichtum an Dolomitgeröllen aus (10-15%).

Thickness
Ca. 10 m.

Components

Mineral Content
  • dolomite

Hierarchy and sequence

Units at roof
Upper boundary
Hasli-Formation
Lower boundary
Erosive Basis über Irchel-Schotter oder Molasse.

Age

Age at top
  • Early Pleistocene
Age at base
  • Early Pleistocene

Geography

Geographical extent
SE Hügel Irchel (ZH).

Palaenography and tectonic

  • Höhere Deckenschotter
Tectonic unit (resp. main category)
Kind of protolith
  • sedimentary
Conditions of formation
Schüttung in N Richtung.

References

Definition
Preusser Frank, Graf Hans Rudolf, Keller Oskar, Krayss Edgar, Schlüchter Christian (2011) : Quaternary glaciation history of northern Switzerland. E&G Quaternary Science Journal 60/2-3, 282-305

p.285: The glaciofluvial gravel on top (‘Irchel-Schotter’) is cut by a channel-like structure in the SE. This channel is filled by younger glaciofluvial gravel (‘Steig-Schotter’) showing a prominent difference in petrography compared to the two older units. This implies that erosion was not a local phenomenon but rather indicates reorganisation of the entire drainage network. All over Irchel, the two previous units (‘Irchel-Schotter´, ´Steig-Schotter’) are covered by overbank and channel fill deposits of a meandering river system, with a thickness between 2 m and 7 m (‘Hasli-Formation’).

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